Sock display form



FIG. 1 is a front, top and right side perspective view of a sock display form showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a top plan view; and

FIG. 5 is a rear elevational view. 

The ornamental design for a sock display form, as shown. 